package 力扣;

/**
 * @author xiaok
 * @create 2021--01-12 13:30
 */

public class _617 {
    public class TreeNode {
        int val;
        TreeNode left;
        TreeNode right;

        TreeNode(int x) {
            val = x;
        }
    }
    public TreeNode mergeTrees(TreeNode t1, TreeNode t2) {
        if(t1 == null && t2 == null) return null;
        if(t1 == null ) return t2;
        if(t2 == null ) return t1;
        TreeNode root  = new TreeNode(t1.val + t2.val);
        root.left = mergeTrees(t1.left,t2.left);
        root.right = mergeTrees(t1.right,t2.right);
        return root;
    }

}
